Double solenoid



Feb.20, 1940. .P, T, ARE, HAL 2,190,650

DOUBLE SOLENO ID Original Filed May 18, 1936 lam 8/77?! AMM/ ATTORNEY Patented Feb. 20, 1940 UNITED STATES DOUBLE SOLENOID Cal-cw and William F. Werner,

Orange, N. 1.

Original application May 18, 1936, Serial No.

Divided and this application Septeml)!!! 26, 1936, Serial No. 102,780

1 Claim. (Cl. 175-341) The purpose of this invention is to provide a quick acting solenoid in which the movement of the core is accentuated as the coil or coils are energized.

5 The invention is a solenoid comprising two coils consecutively arranged or positioned end to end about a core, in which an auxiliary coil is incorporated in one of said coils, and means is provided for connecting a circuit through the coils so that the auxiliary coil will be energized to influence the core an instant before the remaining coils are energized.

This is a divisional application, being separated from our co-pending application with the Serial Number 80,389 in which this solenoid is used to accentuate the movement of the keys of a typewriter.

Solenoids are ordinarily provided with a coil positioned about a core in which the core is influenced by magnetism of the coil and in which the coil is energized when it is desired to move the core, or operate something by the movement of the core. Other solenoids have been provided with cores divided into a plurality of sections 2 and coils have been provided around the cores and consecutively energized for extending the movement of the core, as with such an arrangement the travel of the core may be extended indefinitely, and other devices have been provided for reversing the current flow of solenoids, however, the construction of these devices does not make them applicable for accentuating the movement of the core,'and it has been found that by providing a small preliminary solenoid for -3 starting the movement of the core from rest and then as 50011 as the movement is started applying the full force of the coil, a much more rapid movement is obtained and this is particularly des'rable for electrically operated typewriter keys,

40 organ pipes, and for many other purposes.

The object of the invention is, therefore, to incorporate within a solenoid a small auxiliary coil adapted to start the movement of the core from rest and then applying the full force as soon as the movement of the core is started.

A further object is to provide a solenoidin which the core is divided into sections, making it operable by either alternating or direct current.

And a still further object is to provide a solenod having a quick acting movement, which is of a relatively simple and economical construction.

with these ends in view the invention embodies a solenoid having a core divided into two sec tions, with non-magnetic separators between the sections, having separate coils positioned about the respective sections, an auxiliary coil also positioned about said core, a spring for returning the core, and suitable electric connections through which the auxiliary'coil is first energized and then the remaining coils automatically energized as the movement of the core is started.

Other features and advantages of the invention will appear from the following description taken 10 in connection with the drawing, wherein:

Figure 1 is a view showing the core and coils in elevation in a typical arrangement.

Figure 2 is a view showing a cross section through the solenoid shown in Figure 1. 15

Figure 3 is a plan view of one ofthe discs in one section oi the core.

Figure 4 is a similar view showing one of the discs in another section, in which the slot is positioned on the opposite side of the center. 20

Figure 5 is a view showing one of the discs in perspective showing the relative thickness thereof.

figure 6 is a plan view of the upper end of the solenoid with the connections thereto omitted. 35

Figure 7 is a view showing a typical application oi. the solenoid to the valves of a pipe organ with the action of the solenoid reversed. a

In the drawing the solenoid l is shown as it may be made, wherein numeral l indicates, the upper section, numeral 2 the lower section, and numeral 3 the core. The solenoid is formed with the coil in two sections and with the upper section of the coil compoundwound and it will be noted that one section of the upper coil is first energized and this starts the core downward and then as soon as the core has traveled a short distance a circuitis completed through the other section of the upper coil and the lower -coil thereby accentuating the movement and 9 moving the core downward with a short, quick, or staccato movement; and as soon as the current is released, a spring at the upper end re- ,turns the core to the normal position.

The upper coil i is formed by a coil of wire 45 l on the outer part of thespool l, and with an inner coil 5, and on the lower spool is one complete coil 5, and these coils are connected in a circuit in such a manner that as a switch 1 is closed a circuit is completed through a wire 8, a battery 8, wires l0 and II to the coil 5, and through wires l2 and i3 back to the switch I. The wire i2 is connected to a contact ll which engages a projection on a bar i5 extending up- .ward from the core 3 as shown. with this cir- 55 cult completed-the coil will be energized and this will start the core 3 downward, and as the core movesdownward the projection on the bar l5 will engage a contact I6, as shown in Figure 2, and this will complete a circuit through the other section of theupper coil and through the lower coil through the wires 13, from the switch I, a wire H from thecontact I6, to the coil-4 through a wire I8, and from the coil 4 through the wire ID to the battery and through the wire 8 to the switch. The wire I! also connects to the coil 6 of the lower solenoid and the opposite end thereof is connected by a wire IE to the wire 10 so that the circuit is also completed through this coil. It will be appreciated, therefore, that the action of the core is accentuated because it is first started from the stationary position with a relatively slow movement, and then as the force from the other coils is applied the movement is speeded The upper end of the bar I5 is attached to a stationary member 20 through a spring 2| and it will be'noted that as soon as the current is released the core will be returned to the position shown in Figure 1 with the circuit through the lower coil and through the sections of the upper coilbroken.

-In this design the core 3 is formed with an outer tubular shell 22 and this is filled with a plurality of discs or washers 23 and 24 having slots 25 and 26 extending inwardly from one side, and these discs are separated by a plurality of complete insulating discs 21 as shown in Figure 2. The discs 21 are of fibre or any non-magnetic material, whereas the discs 23 and 24 are of material having magnetic attraction, and with the slots oppositely positioned in the upper and lower portions the complete cycle of the magnetic flux is broken and the solenoid will operate with greater efilciency. The discs 23 and 24 are relativelythin and fit snugly within the tubular oas- .ing 22 and it is preferred to make these discs of soft iron, however, they may be made of any material. The casing 22 is preferably made of fibre or any non-magnetic material, however, this may be-made of any material and an insulating lining may be used on the inner surface if desired. a

Figure 7 shows a typical application of the solenoid which in this design is indicated by the numeral 28, and this is positioned in an outlet connection 29 of a compressed air tank 30 which fore, that the device may be mounted to operate in either direction and used for any purpose.

It will be understood that changes may be made in the construction without departing from. the

spirit of the invention. One of which changes may be in the use of any number of coils, another may be in the use of a core of any other construction, and still another may be in the use of other means for connecting the respective circuits through the coils.

The. construction will be readily understoo from the foregoing description.v In use the device may be provided as shown and described, and it will be noted that with the bar at the lower end of the core attached to a lever or other object and with the current connected through the coils as illustrated, the current will first be applied to the auidliary coil which will start the movement of the core, and then the current will automatically be applied to the other coils, accentuating the movement of the core, and making it possible to operate the lever or device to which the core may be connected with an unusually quick movement. It will also be appreciated that this device may be made of any size, shape, or design, and may be connected to any suitable device.

Having thus fully described the invention, what we claim as new and desire to secure by Letters Patent, is:

A solenoid divided into two parts comprisin two coils in axial alignment, and a common core extending through both of said coils, said core formed of laminated discs in a tubular casing, with a radial longitudinal slot extending through a plurality of the discs at each end of the core, and with the slot at one end oppositely positioned in diametric relation to the slot at the other; said solenoid characterized in that one of said coils comprises two concentric windings forming an inner and an outer coil, and in combination with said solenoid a plurality of contacts positioned to be engaged. by a contact point on the core, and a spring for drawing the core outward to a position at which the core contact point is energized is connected to the said inner coil of 0 one of the said coils and adapted to energize the said inner coil only momentarily whenever current is supplied to the device, said inner coil adapted to start the movement of said core so that the'contact point of the core will engage another contact to energize the outer coil of the coil containing an inner and outer coil, and also the other coil of said solenoid, thereby providing a'starting movement and then an accentuated movement .of said core.

PAUL T. CAREW.

WILLIAM F. WERNER. 

